Mariner&#39;s liquid compass.



' L. A. SHERMAN. MARINBB'S LIQUID COMPASS. APPLICATION FILED JAR'IQ, 1911.

1,024,810. Patented Apr. 30, 191 2.

for examination and repair it "the electricity LOUIS A. SHERMAN, OF PEMBROKE, MASSACHUSETTS.

MARINERS LIQUID COMPASS.

Specification of Letters Patent. Patented A1 31? 3%, fitlll Application filed January 12; 1911. Serial No. 602,53Q.

To all whom it may concern:

Be it known that 1, Lou s A. SHERMAN, a citizen of the United States, and a resident of Pembroke, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements :in Mariners Liquid Compasses, of which the following is aspecification.

My invention relates to improvements in mariners? liquid compasses, and the objects of my improvements are, first, to provide means for the artificial illumination of the compass cardeither wholly or in'part; second, the introduction of arsource of illumination toj reflect on the compass card points immediately under the eyes of the hehnsman; third, the provision of a reilector throwing light upon that portion of said card to be readand further acts as a shield to the sight; fourth, a detachable bottom to the compass bowl, and in other essentials hereinafter specified and particularly defined in the claims.

In the drawing forming a part of this specification, Figure l, denotes a transverse section of the organized. compass, Fig. 2, is a plan of the bowl exhibiting the shield with its reentering angle visually exposing the card points immediately under reading. Fig. 3, designates an alternate form of the attachment admitting light to theinterior of the compass bowl.

Corresponding letters of reference designate similar features throughout the several figures pt the drawing, which A, represents the compass bowl and B the gimbal ring suspending the same in the usual manner.

G designates the detachable opp properly weighted to maintain equipoisef and secured to the bottom of the bowl by-bayonetslots and pins as at D thus permitting removal needed to the illuminating fixtures. These, comprise the base E surmounted by the bulb F, forming the inclosure for the electric light, said bulb may consist of 'White, green or red. glass or frosted .bulbs as desired, posts G are anchorages for the wires transmitting from batteries I or other sources of electric energy. Immediately above the bulb F will be observed the light admitting attachment I-I composed of nonmagnetic metals supporting the glass I protected by a ring, of composite material J referring to i thought desirable,

preferably composed of tin and lead in certain proportions, or other suitable material may be used, the aggregation, by fusing becoming a part of said attachment and is supported by the it is attached and above which is the died; L supporting the compass card M and permitting the penetration oi the light rays through the aperture N in the compass card to the slidable reflector O, which, to insure greater eificien'cy in light concentration may be concaved, the perimeter being broken as at P (Fig. 2) to provide the reentering angleQ, or any other desirable form of aperture which will permit the light to reach the segment of that portion. of the compass card it is desired to illuminate for the purpose of clearer and quicker intergpretation of the characters thereon, said re ector being adapted to be moved about its axis or to he raised from its seat, when readjusting to expose a different segment of the card.

' In the construction of my improved compass, the source of artificial illumination may be at other portions of the bowl other than as illustrated; the distinctive feature being the equalized ditlusion oilight about the compass card and its concentration upon the points of rhumbs to be read without interference to the vision by exposed rays of light as exemplified in the ordinary binlnacle.

The arrangement of the illuminating features are such also as to preclude any disarrangement thereof through the erratic oscillation oi the compass bowl, and the light may, further, be increased by the employment of suitable lens as at Ilhg. 3 if and while there may be other modifications structurally departing from the precise manner illustrated, I desire notto be tion herein disclosed but may use suc equivalents therefor as would come within the fair scope and spirit of my invention, which, having thus described, I desire to secure by Letters Patent of the United States, and I claim 4 1. The herein described mariners compass comprising a bowl having a source of light interiorly, a lens projecting the rays. of light from said bowl, an illuminated inolosure confining the compass card and a surmounted movable reflector adapted to deflect said light rays upon the rhumbs deheld to the strict interpretadiaphragm K to which picted on the reading surface of the compass card.

2. The combination with a compass having a detachable Weighted cup provided with means for the illumination of the compass interior of a removable slidable reflector having a broken perimeter to render visible any desired segment of the compass card, a centrally apertured disk supporting said card, a sustaining diaphragm, a lens thereby supported for the projection and diffusion of light throughout the interior of the compass.

3. In a mariners'compass a bowl containing means for the artificial illumination of the bowl interior, a diaphragm bearing a light admitting attachment, a disk adapted to support the compass card and having a central opening for the penetration of the light, a compass card having a light penetrating aperture and means for the reflection of light downward upon the face of: said card.

4. A. compass bowl adapted forinterior illumination and having asource of light producing energy, means permitting the penetration of the rays of light upward, a disk adapted to support the compass card, and a slidablorcflector having a recntering aperture extending from its perimeter through which certain of the rhumbs of the compass card are read by reflected light.

5. The herein described mariners compass comprising the following 'instrumentalities, to- \vit:a bo\vl having a' detachable Weighted cup, a base mounted on said weight and provided with means for the illumination of said bowl interior, a diaphragm and means centrally located therein for admission of artificial light upward, a disk supporting the compass card and permitting the expansion of said diaphragm, a reflector reflecting the light against the reading surface of the compass card, said reflector having an opening to expose any segment of the compass card.

In testimony whereof I have aiiixed my signature in presence of two Witnesses.

LOUIS A. SHERMAN. lVitnesses J. S. DANIELS, CHARLES E. SHERMAN. 

